Combination coal and wood heating-stove.



R. F- CLARK.

COMBINATION COAL AND WOOD HEATING STOVE.

APPLICATION' FILED Nov. 23, 1915.

1,223,768., Patented Apr. 24, 1917.

@TD STATS FAVFNT FME.

COMBINATION COAL AND WOOD HEATING-STOVE.

Specification of Letters Patent.

Patented Apr. 24, 1917.

Application led November 23, 1915. Serial No. 63,073.

To all whom t may concern:

Be it known that I, ROBERT F. CLARK, a citizen of the United States, and a residentof Salt Lake City, in the county of Salt Lake and State of Utah, have invented certain new and useful Improvements in a Combination Coal and Wood Heating-Stove, of which the following, together with the accompanying drawings, constitute a full, clear, and exact specification, which will enable others skilled in the art to which it appertains to make and use the same.

Mv invention relates to heating' stoves and its objects are:

First. To provide a heating stove in which may be burned all the common grades and sizes of coal, and also ordinary fire-wood, all, with practically7 equal advantage.

Second. To obtain a maximum heating ef feet from the fuel consumed.

Third. To allow easy regulation and a more perfect control than can be attainedv in the ordinary heating stove.

I accomplish these obi ects, by constructing the lower portion of my stove with double walls having an air space between them; the inner wall being formed by a cast iron fire pot and the outer wall by a sheet metal body or shell which extends both alcove and below the fire pot. The horizontal cross-section of my stove is preferably made oval in shape and the fire pot has a lip or flange at its top which extends approximately two thirds of the distance from the front tothe back of the stove on each side, and this lip or flange having a bearing againstthe shell formsv the top closure for'the space between the two walls. At the front of the stove is a closable inlet for admitting air from the atmosphere to the space between the two walls, and at the rear of the stove the said space opens upwardly into what I' choose to call an expansion chamber. This expansion chamber occupies, generally, about one third the area of the corresponding horizontal section of the stove, and the bounding surfaces of the expansion chamber give it somewhat the shape of a carpel of an orange, placed horizontally, with its curved face coinciding with the curved rear portion of the stove shell, and the two extremities of the carpel joining the extremities of the lip or flange already mentioned. The lower inclined wall of the chamber is suitably perforated and its upper inclined wall is continuous, so that a current of air striking the under side thereof will be deflected downwardly and through the perforations or ports in the lower inclined wall, into the fire.

One embodiment of my invention is illustrated in the accompanying drawings in which:

Figure 1, represents a horizontal section taken on the line 1-1 and partly on the line E*1"l in Fig. 4 viewed from above;

Fig. 2, a fragmentary transverse vertical section on the line 2-2 in Fig. 1, looking in the direction of the arrows;

Fig. 3, a fragment, drawn to an enlarged scale of the section on the line 3-3 in Fig. 4 looking from above; and, Fig. 4, a fragmentary longitudinal vertical section on the line 4 4 in Fig. 1.

Similar parts are designated by similar numerals.

Referring to the drawings, 10 represents a portion of the inclosing shell of the stove, the lower part of which is in the form of the frustum of an inverted cone (Fig. 2), though the entire shell is preferably made of one continuous sheet of metal and which is formed as will be described farther on. A cast iron fire pot 11, which may be supported in the usual way, is located in the lower part of the shell 10 the walls of each being spaced apart from the other by the flange or lip 12 on the upper edge of the fire pot. The expansion chamber 13 has the `general shape of the carpel of an orange, the ends of the carpel being brought toward each other to a limited extent, s o that the line of intersection 14, of the meridian planes thereof, and consequently the meridian planes also, will be arched upwardly as shown in Fig. 2, and backwardly as shown in Fig. 1. The meridian planes thus distorted are represented by the upper, continuous, inclined wall 15 and by the lower inclined wall or hood 16, the latter having any suitable perforations or apertures 17. The draft inlet-chamber 18 may project from the fire pot 11, the chamber 18 communicating downwardly with the space 20 between the shell 10 and the lire pot 11. The draft of air passes into the chamber 18 through an opening in its front and may be controlled by any suitable means, for instance, the rotary door 21, which is in common use.

Below the line 22-22 in Figs. 2 and 4, the shell 10 and the lire pot 11 are each corrugated and are so arranged that the corrugations in the one will register as nearly as possible with the corrugations in the other for the purpose of making the space 20 uniform in extent between the opposing surfaces of the shell 10 and the firev pot 11. The corrugations taper from a maximum at the lowest parts of the shell and the fire pot, to nothing at about the level of the line 22-22, as indicated in Figs. 2 and 4f, the relative arrangement of the corrugations being shown by Fig. 3.

I am aware that others have used corrugated stove bodies to increase the radiating surface and have tapered the lower part of the bodies in order to'radiate the heat down-l wardly onto the ioor and I am also aware that corrugated ire pots have been used heretofore, but I do not know of any instance where anyone has anticipated my construction, namely, that of having the fire pot and the surrounding body or shell corrugated to correspond to each other in the manner described, in order that their opposing'faces may be everywhere approximately equidistant from each other, thus allowing a current of heated air to flow through the space between them in a smooth steady stream. Were either of the surfaces perfectly smooth and only the opposing surface corrugated, which has, so far as I know, always been the case heretofore, then a current of heated air flowing between these surfaces, would be subjected to a peculiar pulsating effect caused by the alternately contracted and expanded space through which the heated air would be compelled to flow and consequently be greatly impeded. In using my improved stove, the air draft is admitted into the inlet chamber 18 as shownby the arrows, (Fig 1) then flows downwardly into the space 2O around each side of the fire pot 11, by which the air is heated, and most of it caused to press upwardly, close against the under side of the lip 12 until it reaches the rear of the stove andV Hows into the expansionchamber 13, which latter by its peculiar shape allows a graduated expansion to the stream of heated air, the reaction of which against the back of the chamber forces thel stream forward while thetinclined and arched wall15 deiects it so it will flow through the ports 17 into the re.

The specialobject of the-expansionA chamberis to provide an even flow of-superheated air tothesurface of .the-iire,thereby burning gases .which lordinarily escape, vthrough the chimney.

Having fully described my invention,

therewith, the space included between the.

said intersecting walls opening directly into the space included between the said fire pot and the said surrounding shell, for

the purpose specified.

2. In a stove having a fire pot, a surrounding shell spaced apart therefrom and a suitably located draft inlet, the combination therewith, of an apertured hood surmounting a portion of the said iire pot, and located diametrically opposed to the said draft inlet, the said hood sloping upwardly toward the center of the stove and at a suitable distance from the said center intersecting a superposed solid wall inclined away from the center of the stove, the space included between the said hood and the said wall opening directly into the space included between the said fire pot and the said surrounding shell, for the purpose specified.

- 3. In a stove comprising a fire pot a surrounding shell spaced apart therefrom and a draft inlet located in the front of the said surrounding shell, the combination with the said fire pot of an apertured, suitably curved hood extending over the rear up! per portion thereof, and an upwardly sloping solid wall intersecting the said hood and having a curved edge for bearing against the interior of the said surrounding shell in such a manner that a space having the generalshape of the carpel of an orange will be formed between the said hood and the said sloping wall, this space being in direct communication with the space included between the said fire pot and the said shell, for the purpose specified.

4. In a stove, the combination with a re pot having tapering corrugations, of a surrounding shell having corrugations corresponding to, and registering with, the tapering corrugations of the said fire pot, the fire pot and the shell being suitably spaced apart for the purpose specified.

5. In a stove, the combination with a lire pot having tapering corrugations, of a surrounding shell having corrugations corresponding to, and registering with, the tapering corrugations of the said fire pot, the fire pot and the shell being suitably spaced apart from each other; a draft'inlet leading into the space included between the fire pot and the shell; a suitably shaped expansion chamber communicating with the said included In testimony whereof I aflix my signature space and with the interior of the said fire 1n presence 01: tWo Witnesses.

pot; and an inclined apertuied Wall, all

suitably located, for dciiecting a cnment of HUBERT E CLARK' air from the said expansion chamber doWn- 1Vl'itnesses:

Wardly into the said fire pot for the pur- JOHN W. KENNEDY,

pose specified. MARTIN HELSING.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

